Year	current US$
1971	100403923.83150606
1972	123966942.14876033
1973	198970363.1556978
1974	222007722.00772202
1975	161508922.52089453
1976	169524551.8316446
1977	171817912.51110893
1978	198578595.31772575
1979	241410397.6760493
1980	258637328.70102295
1981	326367496.4615769
1982	300801165.3313911
1983	324658254.46898
1984	355179923.2603961
1985	326342710.9974424
1986	1182403886.7765105
1987	2747137109.254101
1988	2657004830.9178743
1989	3048470142.628869
1990	3248072670.7703342
1991	3017668242.178708
1992	2945555082.9434285
1993	3299596261.268735
1994	4085108981.012272
1995	4725690754.516472
1996	5232412931.871791
1997	4843346151.421547
1998	3922838044.107585
1999	4091546006.5390005
2000	3602511746.366311
2001	3658128243.7636027
2002	4718813149.982749
2003	6272749480.884329
2004	7472268907.5630245
2005	8297542772.653666
2006	8576616302.444718
2007	10368927757.771734
2008	9870668447.318478
2009	8861890186.769941
2010	11484083816.165997
2011	14081884476.079098
2012	14902571159.626953
2013	15744525548.603762
2014	16751652241.241093
2015	15016998204.292265
2016	16410434903.673796
2017	17630277874.81723
2018	17859782853.123184
2019	17981717862.142796
2020	17111544634.606712
2021	20649313905.785828